Once common in the rocky intertidal, these marine mollusks have been affected by overfishing and disease. Thanks to research and conservation, these grazers are making a comeback!
Size frequency on islands
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Box plots for annual size frequency distributions of black abalone (Haliotis cracherodii) at each island. Blue lines represent mean sizes of H. cracherodii at each island pooled across and sites. Red lines represent the cumulative mean. For more information, consult Figure App.F.13.2 in the CINMS 2016 Condition Report.
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Density & counts on islands
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Black abalone (Haliotis cracherodii) mean density from fixed plots from 1985-2014 (left) and mean counts from site-wide searches from 1995-2014 (inset) at four islands in Channel Islands National Marine Sanctuary. Site wide search counts began in 1995 due to the severe declines in abundance that occurred from 1985-1995. Generally, increasing abundances began approximately in the 2007-2009 timeframe. Error bars were constructed using one standard error from the mean. For more information, consult Figure App.F.13.1 in the CINMS 2016 Condition Report. For more information, consult Figure App.F.13.1 in the CINMS 2016 Condition Report.
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